Create a new DatasetGraph that copies the dataset structure of default
graph and named graph and links to the graphs of the original DatasetGraph
Any new graphs needed are separate from the original dataset and created according
to the DatasetGraphFactory.GraphMaker.

Create a new DatasetGraph that copies the dataset structure of default
graph and named graph and links to the graphs of the original DatasetGraph
Any new graphs needed are separate from the original dataset and created according
to the DatasetGraphFactory.GraphMaker.